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To ALLYWHoM 1r MAY coNoENN:

Be it known that-4I, RALPH S. MERSHON, of Zanesville, in the county of Muskingum, and State of Ohio, have in vented'newand useful Improvements in Gravers; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make anduse the same, reference being had to the accompanying drawings, formingpart of this'specication. i

With the gravers so called, now in common use, when desired to engrave or ornament a hollow or concave surface, it is'necessary to bend or curve them, so as to nearly adapt them to'such particular conca'vity,-but a tool so curved or bent, although it answers the purpose very well for the particular concavity for whichit may bebent, yet for others, it is perfectly useless; and, therefore, the principal object of the presentfinvention is to so construct a graver that it can be readily adjusted and set for use upon a surface, whether more or less concave or hollow. In the 'accompanying plate of drawings my improved graver is illustrated- -Figure 1 being a side view of the same, and

Figure .2 a view, in detail, of the cutting-edge to the graver.l

Similar letters of reference indicate like parts.

' A, in the drawngs,'represents the graver, which, at its c'utting-point, is theirevcrse of'A gravel-s inz'co'mmon use; that is, it has a short base or horizontal line, a, and a continuous inclined face, 6, whereby -a person is enabled to cut into the bottom of a very small watch-case, locket, or other article. The graver A. is secured or fastened on a sleeve or tube, B, that has attached to it a plate, C, having one of its sides or edges, D, made of a. circular or arc-shape. By this plate C the graver-holder B is hung toand in the slotted and forked end, E, of a. shank or bar, F, xed in and to the ordinary-shaped wooden handle, G, to gravers. H, a thumb-screw arranged in bar F, so as to be brought to bear against the curved edge to the plate, and thus to secure and hold it in anyr position to which it may be turned or swung,this edge being provided with notches, to the more fully insure its being held by the thumb-screw. i

From the construction' of the tool above described, it is plain to be seen that the handle-shank or bar can be turned freely on the pivot or joint, between it and the plate carrying or holding the graver,V and thus elevated or depressed from or to a given point, at the pleasure of the user, where it can be secured by tightening the set orlthumb-screw, thereby. enabling the user to adapt the graver to any degree of concavity, whether more or leks's great, and to always keep the cutting-surfaco .nearly in a parallel line with the surface to be cut, or, in other words', securing the same result as' is now obtained by the bending or curving of the gravers in common use, but in a much more practicable, convenient, and general manner.

What I claim as new, and desire to secure by Letters Patent, is

1. A graver, so connected to its handle or holder that its cutting-edge can be adjusted substantially as and for the purpose described.

2. I also claim agraverhaving a short base, a, and continuous face-line, b, substantially as and for the RALPH s. MERSHON. Witnesses:

GEO'. A. JONES, JOHN K. ARNOLD. 

